{"id":"CVE-2026-20929","aliases":["EUVD-2026-2134","GHSA-cjjj-mhw7-f4xr"],"status":"published","title":"Windows HTTP.sys Elevation of Privilege Vulnerability","description":"Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02871,"percentile":0.86914,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-284"],"published":"2026-01-13T17:57:02Z","modified":"2026-07-30T21:17:09Z","exploits":[{"source":"metasploit","id":"auxiliary/server/relay/esc8_kerberos","title":"ESC8 Relay: SMB to HTTP(S) via Kerberos","type":"auxiliary","verified":true,"url":"https://www.rapid7.com/db/modules/auxiliary/server/relay/esc8_kerberos"},{"source":"metasploit","id":"auxiliary/spoof/dhcp/dhcpv6_dns_takeover","title":"DHCPv6 DNS Takeover (mitm6-style IPv6 DNS coercion)","type":"auxiliary","verified":true,"url":"https://www.rapid7.com/db/modules/auxiliary/spoof/dhcp/dhcpv6_dns_takeover"},{"source":"metasploit","id":"auxiliary/spoof/ipv6/ipv6_ra_dns_takeover","title":"IPv6 Router Advertisement DNS Takeover (RDNSS IPv6 DNS coercion)","type":"auxiliary","verified":true,"url":"https://www.rapid7.com/db/modules/auxiliary/spoof/ipv6/ipv6_ra_dns_takeover"}],"products":[{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 23h2"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1 (server core installation)"},{"vendor":"microsoft","product":"windows server 2008 service pack 2"},{"vendor":"microsoft","product":"windows server 2008 service pack 2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012 r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2022, 23h2 edition (server core installation)"},{"vendor":"microsoft","product":"windows_10_1607"},{"vendor":"microsoft","product":"windows_10_1809"},{"vendor":"microsoft","product":"windows_10_21h2"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_server_2008"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2022_23h2"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20929","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20929"},{"url":"https://github.com/advisories/GHSA-cjjj-mhw7-f4xr"}],"sources":{"cve":[{"id":"CVE-2026-20929","title":"Windows HTTP.sys Elevation of Privilege Vulnerability","description":"Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-01-13T17:57:02.86Z","modified":"2026-07-30T20:47:22.006Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T13:35:44.571002Z"}],"euvd":[{"id":"EUVD-2026-2134","description":"Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-01-13T17:57:02Z","modified":"2026-07-30T20:47:22Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T18:02:26.773248Z"}],"ghsa":[{"id":"GHSA-cjjj-mhw7-f4xr","title":"Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges...","description":"Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-01-13T18:31:10Z","modified":"2026-01-13T18:31:18Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T15:05:35.156514Z"}],"nvd":[{"id":"CVE-2026-20929","description":"Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-01-13T18:16:19.827Z","modified":"2026-07-30T21:17:09.713Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:12:04.066712Z"}]}}